Which is the best example of a new substance forming? Options: lighting a match, cutting a piece of paper, popping a balloon, hitting a nail with a hammer
NAFES Practice

Flashcard
•
Science
•
6th Grade
•
Hard
Kyle Oakes
FREE Resource
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40 questions
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1.
FLASHCARD QUESTION
Front
Back
lighting a match
Answer explanation
The best example of a new substance forming is lighting a match, as it involves a chemical reaction that creates a new substance (fire) from the matchstick and oxygen.
2.
FLASHCARD QUESTION
Front
What caused the change of a piece of iron from shiny to rusty?
Back
a chemical reaction
Answer explanation
Students observed a piece of iron change from shiny to rusty due to a chemical reaction, not a heat or cold reaction. The rusting process involves a chemical reaction with oxygen in the air.
3.
FLASHCARD QUESTION
Front
Which of the following is a chemical property of water?
- Reacts with pure sodium
- Boils at 100 oC
- Is liquid at room temperature
- Has a density of 1 gm/mL
Back
Reacts with pure sodium
Answer explanation
The correct choice is 'Reacts with pure sodium' because this is a chemical property of water, indicating its ability to undergo a chemical reaction with sodium.
4.
FLASHCARD QUESTION
Front
Which of the following is an example of sublimation? Dry Ice, Water boiling into steam, Ice cream melting, Water freezing into ice
Back
Dry Ice
Answer explanation
Dry Ice is an example of sublimation because it changes directly from a solid to a gas without passing through the liquid phase.
5.
FLASHCARD QUESTION
Front
Which phrase most accurately describes a chemical change?
Back
A change on the molecular level.
Answer explanation
The phrase 'A change on the molecular level' most accurately describes a chemical change as it involves alterations at the molecular level, distinguishing it from changes in appearance, taste, or size.
6.
FLASHCARD QUESTION
Front
Which of the following is NOT an example of a physical change?
- crumpling paper
- sharpening a pencil
- clothes shrinking
- sour milk
Back
sour milk
Answer explanation
The correct choice is 'sour milk' because it involves a chemical change, not a physical change like the other options.
7.
FLASHCARD QUESTION
Front
What pH is the strongest base?
Back
14
Answer explanation
The strongest base has a pH of 14, as it is the highest value on the pH scale indicating a high concentration of hydroxide ions.
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